--- dnscache.c.orig	Mon Feb 26 20:41:13 2001
+++ dnscache.c	Mon Feb 26 20:40:40 2001
@@ -389,6 +389,7 @@
 int main()
 {
   char *x;
+  char nxdip[4];
   unsigned long cachesize;
 
   x = env_get("IP");
@@ -435,6 +436,13 @@
     response_hidettl();
   if (env_get("FORWARDONLY"))
     query_forwardonly();
+
+  x = env_get("NXDSPECIAL");
+  if (x) {
+    if (!ip4_scan(x,nxdip))
+      strerr_die3x(111,FATAL,"unable to parse NXDSPECIAL IP address ",x);
+    query_nxdspecial(nxdip);
+  }
 
   if (!roots_init())
     strerr_die2sys(111,FATAL,"unable to read servers: ");
--- query.c.orig	Mon Feb 26 20:41:21 2001
+++ query.c	Mon Feb 26 20:08:33 2001
@@ -20,6 +20,15 @@
   flagforwardonly = 1;
 }
 
+static int flagnxdspecial = 0;
+static char nxdip[4];
+
+void query_nxdspecial(const char ip[4])
+{
+  byte_copy(nxdip,4,ip);
+  flagnxdspecial = 1;
+}
+
 static void cachegeneric(const char type[2],const char *d,const char *data,unsigned int datalen,uint32 ttl)
 {
   unsigned int len;
@@ -246,6 +255,7 @@
     case_lowerb(key + 2,dlen);
     cached = cache_get(key,dlen + 2,&cachedlen,&ttl);
     if (cached) {
+      soattl = rcode = 0;
       log_cachednxdomain(d);
       goto NXDOMAIN;
     }
@@ -695,7 +705,12 @@
     NXDOMAIN:
     if (z->level) goto LOWERLEVEL;
     if (!rqa(z)) goto DIE;
-    response_nxdomain();
+    if (flagnxdspecial && typematch(DNS_T_A,dtype)) {
+      if (!response_rstart(d,DNS_T_A,rcode == 3 ? soattl : ttl)) goto DIE;
+      if (!response_addbytes(nxdip,4)) goto DIE;
+      response_rfinish(RESPONSE_ANSWER);
+    } else
+      response_nxdomain();
     cleanup(z);
     return 1;
   }
--- query.h.orig	Mon Feb 26 20:41:29 2001
+++ query.h	Mon Feb 26 20:02:59 2001
@@ -28,5 +28,6 @@
 extern int query_get(struct query *,iopause_fd *,struct taia *);
 
 extern void query_forwardonly(void);
+extern void query_nxdspecial(const char *);
 
 #endif